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本帖最后由 nero1981 于 2012-3-23 10:57 编辑 9 K0 F" r; r/ ?: x* z: S0 W
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COVER Spring sun lights up signaling pathways. In plants, the UVR8 protein senses ultraviolet-B (UV-B) wavelengths in sunlight, triggering changes in growth and development, including the production of a protective chemical sunscreen. Pyramids of tryptophan rings intrinsic to UVR8 create a built-in light switch; no separate chromophore is required. Understanding how plant growth varies with changes in sunlight becomes more important as we adapt to climate change. See page 1492. Photo: iStockphoto.com2 q, r2 m: w3 Z7 X, r2 u! a
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